you push a box across the floor with a force of 30n you it 15 meters in 8 seconds. how much work did you do how much power did y
2 answers:
Answer : W = 450 J and P = 56.25 Watts
Explanation :
It is given that,
Force, F = 30 N
Distance, d = 15 m
Time, t = 8 sec
The work done is given as :
W = F.d
So, the work done to push a box across the floor is 450 N.
Mechanical power is defined as,
P = 56.25 Watt
The power is 56.25 Watts.
Hence, this is the required solution.
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Answer:
t = 3.516 s
Explanation:
The most useful kinematic formula would be the velocity of the motorcylce as a function of time, which is:
Where v_0 is the initial velocity and a is the acceleration. However the problem states that the motorcyle start at rest therefore v_0 = 0
If we want to know the time it takes to achieve that speed, we first need to convert units from km/h to m/s.
This can be done knowing that
1 km = 1000 m
1 h = 3600 s
Therefore
1 km/h = (1000/3600) m/s = 0.2777... m/s
100 km/h = 27.777... m/s
Now we are looking for the time t, for which v(t) = 27.77 m/s. That is:
27.777 m/s = 7.9 m/s^2 t
Solving for t
t = (27.7777 / 7.9) s = 3.516 s